EEOP-Based Interaction Path Differentiation and Control Parameter Optimization to Mitigate Oscillation in Multi-DFIG Wind Farm

With increasing wind power, interaction of the wind turbine generators (WTGs), e.g. doubly-fed induction generators (DFIGs), may cause oscillation in the wind farm and endanger the power systems, so it is necessary to optimize the parameters of the WTG to mitigate the interaction. The existing study often focuses on the interaction between the wind farm and the system, but ignores the interaction among the WTGs. In this paper, the interaction path and parameter optimization for the wind farm with the DFIGs is studied. The novelties are, 1) The analytical expression for interaction path in the wind farm is newly derived with the proposed expanded effective open-loop process (EEOP). 2) A new indicator is proposed to evaluate the gain of the interaction paths for two-input, two-output characteristics of the DFIGs. 3) Analytical expression for the sensitivities of the interaction with respect to the control parameters is newly derived. 4) A multi-objective model including the sensitivity model to optimize the parameters of the DFIGs is proposed to mitigate the interaction. In the numerical analysis, a wind farm with multi-DFIG is used to verify the interaction paths and the indicator, and validate the mitigation effect with the optimized parameters of the DFIGs.